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O. S. FISCHER. Upright Piano-Forte Action Frame.

No. 224,008. Patented Feb. 3, 1880! Inventor.

Witnesses:

H. PETERS, PHOTO-LHHOGMFHER, WASHlNGTOH, D C.

UNITED STATES PATENT Orrrcs.

CHARLES S. FISCHER, OF NEW YORK, N. Y.

UPRiGHT-PlANO-FORTE ACTlON-FRAME.

SPECIFICATION forming part of Letters Patent No. 224,008, dated February 3, 1830.

Application filed November 20, 1879.

To all whom it may concern Be it known that I, CHARLES S. Fisonnn, of the city, county, and State of New York, have invented a new and Improved Upright- Piano-Forte Frame, of which the following is a specification.

My invention relates to improvements in the manner of connecting the action-frame of upright pianos with the back and main frame; and the object of the improvements is to prevent derangement of the action-frame by the shrinkage and swelling of the wood, and from the jarring to which the instruments are subjected also, to facilitate the removal and replacement of the action-frame.

The invention consists in fixing the screws which connect the action-frame to the wrest in the back of the case, instead of in the wrest-plank, as heretofore.

The invention consists, secondly, in providin g the end standards with L-shaped slots for the reception of pivots and bracing-pins that allow perfect freedom of oscillating movement to the action-frame, but prevent vertical movement when in position for use.

In the accompanying drawings, Figure l is a front elevation of an u n-ight-piano actionframe provided with my improvements. Fig. 2 is a vertical transverse section of the same, taken on line 0 c of Fig.1; and Fig. 3 is a vertical transverse section of a modification.

Referring to the drawings, A is the wrest or main frame. B is the back of the pianocase. ais the wrest-plank. b is the bottom rail, and 00 m are the end blocks, to which the action frame is pivoted. O O are the end standards of the action-frame, and D represents the intermediate standards. (l is the hammer-rail.

The parts G D d constitute the action-frame. E represents the screws which connect the action-frame with the wrest.

Heretofore those screws have been secured directly in the wrest-plank; but on account of their shortness in that construction they became loose in a short time, and the swelling and shrinkage of the wood likewise aii'ected them and deranged the proper adjustment of the action.

In my invention a hole, 6, is bored through the wrest-plank a and wrest A for each of the screws E, preferably larger in diameter than said screws, and concentric to said hole 0 a threaded hole, 1', is made through the hack B. A nut, g, is inserted in the hole 0, and is placed against the back 13. The screw E is now passed through hole 0, and screwed through nut 9 until its end protrudes through the back 13, and on the outer end is placed another working nut, h, which is screwed up tightly against the back B, as in Fig. 2. In this way the screws E are firmly and securely connected with the back B, and they are thereby made altogether independent of the condition of the wrest and wrest-plank. At the same time said screws are easily removed when necessary for any purpose and adjusted in the bearings.

In Fig. 3 a modification of the above-described invention is shown. The nuts g h are dispensed with, and in place thereof the holes 1" through back B are screw-threaded, and the screws E are screwed into said holes.

The tapering or rounded lower ends of the intermediate standards, I), are set into blocks F, that are affixed to the bottom rail, 7). The lower ends of the end standards, 0, are provided with an L-shaped slot, 2', as shown.

In each of the end blocks, 50, are secured two pins, 7x; and 7;, which enter into the L-shaped slots t of standards 0, and they are at such a distance apart in a vertical line that is against the upper end of said slot, and 7c is against the lower end and in line with the horizontal outlet thereof. This arrangement of the pins 7. 7.1 prevents any vertical movement of the action-frame so long as the oscillating ends of the standards are in connection with the screws E. If it is desired to remove the action-frame, the upper ends of the standards are disconnected from the screws E, to which they are held by nuts m, and the frame is turned to a horizontal position on the pins 7.7, and may then be easily lifted oif. To replace the frame it is held in a horizontal position, and the pins 7t It are passed into the L-shaped slots 07, and the frame is then swung to a vertical position to connect with the screws E.

It will be perceived that the pins 7." serve to brace the action-frame and prevent its vertical play; but they do not prevent said frame from swinging on the pivots 7..

I claim-- 1. As an in'iprovement in upright piano frames, the wrest A and wrest-plank a, provided. with the apertures e, in combination 5 with screws E and frame 0 D, substantially as described.

2. The screws E, held by the back B, in combination with the wrest A and wrest-plank a, which are provided with the holes 0, and with 10 the standards 0 D and nuts on of the actionframe, substantially as described.

3. The end standards, 0 0, provided with L-shaped slots 27, in combination with the pivots 7c and pins k, as and for the purpose described. 1 5

4. The back B, holdin g the screws E, in combination with the perforated wrest or frame A and perforated wrest-plank a, the apertures being larger than the diameters of said screws, substantially as herein shown and described. 20

CHARLES S. FISCHER. Vitnesses TOMPSON B. Mosnnn, WILLIAM H. 0. SMITH. 

